Copying device having a slit-exposure system

ABSTRACT

A compact, electrophotographic copying device in which the copy stand is horizontally moveable over the top of the copier housing. Copy on the copy stand is illuminated through a slit exposure system at one end of the housing, and the reflected image passes through an L-shaped optical system to the exposure portion at the other end of the housing. Photosensitive copy paper moves downwardly across this portion synchronously with movement of the copy stand. The copy paper is fed from a feed position between the copy stand and the optical system.

United States Patent Komori et al.

[151 3,704,944 [451 Dec. 5, 1972 [54] COPYING DEVICE HAVING A SLIT-EXPOSURE SYSTEM [72] Inventors: Shigehiro Kolnori, Kawasaki; AkiraKurahashi; Jiro Sato, both of Tokyo, all of Japan [73] Assignee: CanonKabushiki Kaisha Co. Ltd.

[22] Filed: March 30, 1970 [2l] Appl. No.: 22,115

Related US. Application Data [63] Continuation of Ser. No. 688,2l3, Dec.5, 1967,

abandoned.

[30] Foreign Application-Priority Data v Dec.l0, 1966 Japan ..4l/l12995May 24, I967 Japan ..42/33030 Aug. 10, 1967 Japan ..42/51s14 [521u.s.'c|. ..3ss/s, 355/10, 355/27,

[51] Int. Cl. ..G03g 15/00 [58] Field of Search ..355/8, 10,27, 51, 65,66

[56] References Cited UNITED STATES PATENTS 3,421,8l6 1/l969 Robertsonet al. ..35S/8 3,424,526 l/l969 Sacre ..355/l0 Primary Examiner-SamuelS. Matthews Assistant Examiner- R. A. Wintercom Attorney-John ThomasCelia, Joseph M. Fitzpatrick, Charles B. Cannon, Lawrence F. Scinto,Carroll G. Harper, Charles W. Bradley, Edwin T. Grimes, William J.Brunet and Robert L. Baechtold [5 7] ABSTRACT A compact,electrophotographic copying device in which the copy stand ishorizontally moveable over the top of the copier housing. Copy on thecopy stand is illuminated through a slit exposure systemat one end ofthe housing, and the reflected image passes through an L-shaped opticalsystem to the exposure portion at the other end of the housing.Photosensitive copy paper moves downwardly across this portionsynchronously with movement of the copy stand. The copy paper is fedfrom a feed position between the copy stand and the optical system.

10 Claims, 10 Drawing Figures PATENTED 1 3,704,944

SHEET 5 BF 5 FIG 9 FIG.IO

COPYING DEVICE HAVING A SLlT-EXPOSURE SYSTEM This application is acontinuation of application Ser. No. 688,213, filed Dec. 5, 1967 and nowabandoned.

This invention relates to a copying device and more in particularrelates to a copying device of slit exposure system in which the copystand moves, and relates to an electrophotographic copier of the samesystem.

Generally speaking, the capacity of the light source of a copier ofslit-exposure system is smaller than that of the copying devices of sucha system according to which the whole surface of the copy issimultaneously exposed, and it is well known to those skilled in the artthat slit-exposure system is more advantageous in that the device ofslit-exposure system can be minimized when compared with theall outexposure system.

As the conventional copiers of such a system as above, the copiers of asystem in which a copy is fixed, and the light source and thephotosensitive plate are moved at the equal speed, and the lens on thelight axis is moved at one half of the speed of the motion of thephotosensitive plate (in case of equimagnification copying), and theequimagnification image is obtained on the photosensitive plate throughthe fixed slit, are known, but in such a system as this, the distancebetween the fixed copy and the photosensitive plate becomes great, andthe device becomes larger, which is accounted to be the drawback of theconventional system.

There is another prior system proposed as the counter measures forremoving said drawback, according to which two fixed mirrors areprovided on the light path of the optical system, and the light rayscoming from the copy generated by the moving light source, are reflectedsidewise by the first fixed mirror to lead the reflected light rays intothe moving lens, and the penetrating light rays are reflected by thesecond fixed mirror parallely provided with first fixed mirror, and areled into the fixed slit, but in accordance with this system, thedrawback of the preceding conventional system can be removed by bendingthe light path by the two fixed mirrors, and it is possible to minimizethe device to some extent, but the position of the light axis of thelight rays coming into the first fixed mirror and the second fixedmirror, is gradually moved on the mirrors along with the movement of thelight source and the lens, and therefore, the width of the first andsecond mirrors is required to correspond to the moving distance of thelight source, i.e., correspond at least to the width of the copy imagein the scanning direction.

To use such large fixed mirrors brings about such disadvantages as thecomplicatedness of the mechanism for retaining the precision of angle,and the plane surface, and the processing of the mechanism or the like,and as a result the apparatus becomes more expensive.

This invention relates to copying device which has different system fromthose copying devices of the conventional system, and this inventionwhich removes all the drawbacks of the conventional devices has suchadvantages that the device is small and light, and the operationabilityis excellent.

In other words, this invention is characterized in that a copy standwhich moves horizontally above the easing of the copier, is provided,and the moving copy is illuminated in the form of slit at one end of thecasing,

and the image of the reflected light is introduced to the exposingportion at the other end of the casing, and the photosensitive papermoving in synchronous movement along with the copy, is exposed, and thephotosensitive paper feeding base is provided in the space at the upperportion of the casing between the moving copy stand and L letter formoptical system.

An object of this invention is to provide the copying device ofslit-exposure system of high utility which is small and light and isvery convenient to operate, and has removed all the drawbacks of theconventional devices.

Another object of this invention, is to provide a compact copier ofslit-exposure system in which a reciprocating copy stand and L letterform optical system are adopted, and the copy is slit-exposed, and atthe same time a photosensitive material feeding portion is providedwithin the chamber between the stand and the optical system so that thespace of the device, can be fully utilized.

Another object of this invention is to provide the copying device ofslit-exposure system in which the illuminating device and the exposingportion are provided at the respective end portions of the casing, andthe increase of the temperature of the photosensitive plate and thecasing is lowered as much as possible.

Another object of this invention is to provide the copying device ofslit-exposure system in which a blower-duct is provided at anappropriate position inside the casing, and thereby the cooling of theilluminating means is carried out and at the same time it takes part inthe drying of the photosensitive paper.

Another object of this invention is to provide the copying device ofslit exposure system in which the jetting opening of the blower-duct isforked, and by facing the forked ducts against both end portions of thephotosensitive paper without interfering the light path of the opticalsystem to increase the drying effect of the photosensitive paper.

Another object of this invention is to provide the copying device ofslit-exposure system in which a member for preventing the naturalexposure of the photosensitive paper is provided, and even if the deviceis erroneously operated when the member is placed at its not-operationposition, the machine is prevented from damaged.

Another object of this invention is to provide the copying device ofslit-exposure system in which the driving means for synchronouslycarrying out the movement of the copy stand and the photosensitivematerial is provided in combination of a simple normalreversal rotationmechanism with the drive shaft which is rotated in a definite direction.

Anotherobject of this invention is to provide the copying device ofslit'exposure system in which the moving copy stand can satisfactorilymove over the exposure process in accordance with the size of the copy.

Further object of the invention is to provide the copying device ofslit-exposure system in which during one directional movement of thestand, the photosensitive material is fed to a predetermined positionand charged, while during another directional movement of the stand, thephotosensitive material is exposed.

Other objects and the characteristics of this invention will beclarified from the detailed explanations of illustrative embodiments ofthis invention in accordance with the attached drawing in which:

FIG. 1 shows an appearance of an electrophotographic copying deviceaccording to this invention;

FIG. 2 is a vertical cross section of FIG. 1;

- FIG. 3 is a horizontal cross section of FIG. 1;

FIG. 4 shows its driving mechanism;

FIG. 5 shows a reciprocating mechanism for moving the copy stand;

FIG. 6 shows an elevation of FIG. 5;

FIGS. 7 and 8 show circuits used for the inventive device;

FIG. 9 shows a portion of sending mechanism of the photosensitive sheetpaper; and

FIG. 10 shows a portion of sending mechanism of the photosensitive paperwound around the roller.

Concrete explanations are given about the embodiments shown in theattached drawings, in which 1 is a casing, 2 is an arm extending on oneside of the casing from the upper portion thereof (on the left side inFIG. 2), and the guide rail 3 of the copy stand 4 is provided on the arm2 and the casing 1, 5 is a glass plate on the copy stand, 6 is a rubberplate for controlling the copy on the glass plate, L is a lamp forilluminating the moving py, and 8 and 9 are the reflecting covers forconcentrating the light rays in the form of slit.

The optical system 10 is an L form cylinder containing a mirror 11 and alens 12 for leading the image of the copy into the exposing portion 13,14 is a paper feeding base provided in shaped space formed by the rail 3and the L letter form optical system 10; 15 is a feed roller for feedingphotosensitive papers p laid on the base 14 one by one, and leads thephotosensitive papers almost perpendicularly down to the chargingportion 19 and the exposing portion 13 through three pairs of rollers 16through 18. The photosensitive papers abut to the projected plate A bythe rotation of the roller 15, and as the roller 15 further rotates thetop paper alone climbs up the plate A by the frictional force so as tobe fed between the pair of rollers 16. The member 20 is a liquiddeveloper provided at the lower portion of the optical system 10, i.e.,on the bottom portion of the casing, and develops the photosensitivepapers sent from the roller 18 along the guide plate 21, and afterhaving squeezed the liquid with the squeezerollers 22, the developedpaper is led to the drier 23. Within the drier 23, the air in theneighborhood of the illuminating portions 7 to 9 suctioned by a blower24 and sent through a duct 23 into a heater 25 is heated therein andblown to the photosensitive paper sent from the developer 20, and thedrying and the fixing of the image is carried out, and then thephotosensitive paper is sent into the copy-tray 27 by the send-rollers26.

The heater 25 is provided inside the duct, but it can be sometimesprovided outside the duct, or the dryingfixation of the image can bedone directly by the heater, and air is appropriately sent towards theheater from the duct to prevent the over-heating. The driving mechanismgenerally designated by 33 of the copy stand (FIG. 3) and the drivingmechanism of the sendrollers 17 and 18 are interlocked so that thetransmission-speed of the photosensitive papers P passing through theexposure portion 13 and the advancing speed of the copy stand 4 in thedirection shown by an arrow a can be made equal. Throughout thespecification, the advancing movement is in the direction of the arrow aand the reversing movement is in the direction of an arrow b.

The copy stand reciprocating mechanism 33 has such a structure as isshown in FIG. 4, that the belt 37 connected to both ends 37 and 37 ofthe copy stand 4 is wound around the reciprocating drum 39 through theguide roller 38 to reversibly rotate the reciprocating drum 39, and FIG.5 shows its details.

The feed-roller l5 and the send-rollers 16 are interlocked to therotating portion of the independent motor or rubber rollers 17, 18through a clutch, and when the photosensitive paper passes through thefeedroller 15, the following photosensitive paper is continuously sentout, and the photosensitive paper operates a microswitch MS, to stop theoperation of the reciprocating mechanism 33 (FIG. 2). The rubber rollersl7, 18, the developer 20, and the drier 23 are driven by the main motorM through the chain 46 (FIG. 4).

The copy stand reciprocating mechanism is interlocked so that when thecopy stand 4 is stopped on the right side as is shown in FIG. 1, and acopy is placed, and when the start-button SB provided on the operationboard 36 (FIG. 1) is pushed, the photosensitive paper P can be started,and the advancing movement in the direction of the arrow a of the copystand for exposing can be started right before the end of thephotosensitive paper P begins to enter the exposure portion. The imageof the copy is led to the exposing portion 13 when the copy stand 4 isadvanced, and the photosensitive paper is slit-exposed.

The duct 23, of the drier 23 is provided in the space between the lowerportion of the paper feeding base 14 and the L letter form opticalsystem, and the end portion thereof is shaped into forked ducts 28, and28 and these forked ducts are passed outside of the both end surfaces ofthe optical system, respectively, and hot air is sent to the positionclose to both end portions of the drier. The blower 24 sucks the air inthe interval between theaslant partition cover of the copy tray 27 atthe lower portion of the lamp L and in the neighborhood of the rear wallsurface l4, of the paper feeding base 14. Namely, the blower 24 sucksthe hot air above the optical system and around the lamps L, andprevents the deterioration of the photosensitive paper, which is causedsince the left end portion of the paper feeding base is heated by theradiant heat carrying convertion reflected by the reflecting board 9,and as a result, the photosensitive paper is heated thereby, and at thesame time the blower 24 saves the wattage of the heater by making use ofthe calorie in the drying operation, and it also accelerates the uniformdrying all over the photosensitive paper by the forked ducts 28, and 28since both ends of the photosensitive paper cannot be easily dried whilethe central portion of the photosensitive paper can be easily dried. Thelamps L are provided on the left end portion of the casing 1, and iscovered with a member of excellent ventilation such as a punching metal.This is for transmitting the heat of the lamp only by little into thecasing as well as the inside thereof, and at the same time this enablesthe sufficient cooling by the outer air.

The lid 29 is provided on the paper feeding base 14 for preventing thedeterioration of the photosensitive paper caused by the pre-exposure,and the placing of photosensitive papers on the base 14 can be done byopening the lid 29, and by manually holding up the feed-roller 15. It isso planned in size that when the machine is operatedwith the lid open orwith the, feed roller held up by mistake, the copy stand will not hitthe lid or the feed-roller. When the lid is closed, the feedroller ispushed by the closing operation to turn back to the position ofoperation.

The cover plate 35 prevents hot air exhausted from the outlet opening ofthe drier to be retained within the machine and at the same time,prevents the hot air from gradually increasing the temperature insidethe machine as it turns back directly to the lamps, and circulatesbetween the lamps and the drier to lose the cooling effects after all.Therefore, the air sucked by the blower'24 is the outer air not coveredby the front cover 35, and therefore the cooling effect working on thelamps is made excellent.

The copy stand can be designed so that it can be moved either fromadvancing (in the direction a) to reversing direction (the copy standstops above the easing as in FIG. 1), or from reversing direction b (thecopy stand stops on the left portion of the arm as in FIG. 2) .to theadvancing direction a depending on the position where it stops.Thepresent embodiment is an example of p the movement from advancing ato reversing b, however, both cases have the following features,respectively. i

l. Advancing-Reversing movement:

Advancing movement shown by the arrow a is the exposing process, andtherefore it can be turned into the reversing movement at the positionwhere the exposure is completed, and consequently the position at whichthe exposure is completed differs depending on the size of the copy orthe photosensitive paper. For example, when slider 49 is set inaccordance with the size of a copy, the operation piece 51 which isinterlocked to the slider 49 (FIG. 1 )operates the microswitch MS (FIGS.1, 3) by the advancing movement of the copy stand, and it is turned intothe reversing movement. There fore, when a smaller copy is applied, thecopying operation is finished faster, which can be accounted to beadvantage. Notations of B A, and B, generally designated by 50 areindicators for showing the size of the copy.

2. Reversing- Advancing movements:

In this case, the fore end of the photosensitive paper passes throughthe paper feeding and charging processes in the reversing movement (thedirection b), and it stops right after the completion of the advancingmovement, i.e., the completion of the exposing process, and the exchangeof the copy can be made faster by the time required for the'reversingmovement. However, it is impossible to change the range of reciprocatingmovement in accordance with the size of the copy without changing thestop position for the exchange of the copy (original).

The following isv an explanation about the reciprocating mechanism 33.In the embodiment shown in the drawing, the drive-shaft 41 is rotated bythe ,main motorM -through the speed-change gear trainsG through G andthe normal rotation gear 42, reversal rotation gear 43, and sprocketwheel 47 are simultaneously rotated, and thereby the-' paper feedingmechanism and reciprocatingmechanism driven by the same motor whiletheyare synchronized. The driveshaft 41 is always rotated, and when aphotosensitive paper P operates the micro-switch MS; (FIG. 2) and entersthe exposing process, the normal rotation magnet MG, is operated torotate the arm 60, in the clockwise direction with the shaft4l as thecenter of the rotation as is shown in FIG. 5, and the normal rotationidler 44 and the reversibly rotating gear 40 are meshed to each other tothe effect that the reversibly rotating gear40 and the reversiblyrotating drum 39 can be rotated in the normal direction so as to movethe copy stand in the advancing direction shown by the arrow a.

When the copy stand completes the predetermined exposing process, andthe operation piece 51 operates the micro-switch M8 the normal rotationmagnet MG, is released to stop the advancing movement, and at the sametime, the reversal rotation magnet MG, is operated to the result thatthe reversal rotation arm can be rotated in the counterclockwisedirection, and the reversal rotation idler 45 is meshed with the gear 40to reversally rotates the drum 39 through the shock absorbing mechanism,and to move the copy stand in the reversing direction. In this state,the gear ratio of the normal rotation gear 42, the reversal rotationgear 43, and the gear 40, is appropriately selected to determine thespeed ratio of the advancing movement and reversing movement andgenerally quick return (quick reversing movement) is carried out toshorten the time necessary for one cycle. Therefore, a shock absorbingmechanism is provided for absorbing the shock caused by the switching ofthe meshing of the normal rotation gear and reversal rotation gear, asthe rotation of the gear in the reversal rotation is great. For example,when the gear 40 is converted from the advancing rotation a to thereversal rotation b, the gear 40 alone is rotated by theallowance of thelong hole 62 and during which the spring 53 absorbing energy, and thenrotates the drum 39 through the friction board 52 and the pin 63. Whenthe gear 40 is rotated in the normal direction, the rotation is directlytransmitted to the drum 39 through the gear 40, pin 63, the frictionboard 52, and no lag in timing and synchronization is brought about whenexposure is done. FIG. 7 shows an embodiment of the circuit structure.When the main switch S is turned on, the blower 24, the heater 25, themain motor M,

begin to operate, and high pressure voltage source HV is operated. Thephotosensitive paper is sent out by the feed roller 15 during thecopying operation, and the micro-switch MS, is operated with the foreend portion of the photosensitive paper to the result that the feedmotor M is stopped (see FIG. 2) and the photosensitive paper is stoppedbetween a pair of rollers 16.

When start button SB is pushed, the relay RL, is operated to close thecontacts K and K, and the feed-motor M is rotated to the result that thephotosensitive paper is started and passed through the charging deviceand the microswitch M8 is operated, and the photosensitive paper is sentinto the developer 20 and drier 23 through the exposing portion 13 bythe send-rollers 17, 18.

On the other hand, the relay RL is operated by the operation of M8 andthe contacts K and K are closed and K is opened, the drum 39 which hasbeen stopped in the state wherein the micro-switch MS (FIG. 5) isoperated in the opened state by the operation piece 54, is rotated inthe normal direction as the normal rotation idler 44 and the gear 40 aregeared in by the operation of the normal rotation magnet MG,, and thecopy stand 14 is drawn by the steel belt 37 to be moved in the advancingdirection a, and the exposure lamps L are turned on. It is hereby addedthat the operating position of the micro-switch M8 is adjusted so thatthe end of the image of the copy and the fore end of the photosensitivepaper are agreed.

Next, the exposure of the copy is carried out by the advancing movementof the copy stand, and when the operation piece 51 which has been set inaccordance with the size of the copy, operates the micro-switch M8,, therelay RL is released and the contacts K K,., are opened, and the contactK is closed.

Therefore, when the normal rotation magnet MG, is released, the reversalrotation magnet MG, is operated, and the gear 40 is geared with thereversal rotation idler 4S, and the drum 39 is reversally rotated, andthe copy stand is simultaneously moved in the reversing direction. Thedrum 39 is reversally rotated, and the operation piece 54 (FIG. 5)operates the micro-switch MS, at the position where-the copy standterminates the reversing operation, and the drum and the copy stand arestopped, and the whole process is finished.

When the rear end of the photosensitive paper passes through the feedroller before the whole process is finished. the next photosensitivepaper is sent out, and the paper sending speed of the feed roller issufficiently slower than that of the paper sending speed of thefeedroller 16 (which is the same as the feeding speed of thefeed-rollers l7, l8), and therefore when the end of the nextphotosensitive paper is fed in the feed-roller 16, the rear end of thepreceding photosensitive paper has already passed the roller 16 and Ms,.Therefore, the micro-switch MS, is already released, and the relay RL,is also released, but the motor M keeps on rotation by the alwaysclosing contact X of the micro-switch MS,, and is stopped by theoperation of the microswitch MS, with the fore end of the nextphotosensitive paper, and the preparation for the next copying operationis finished.

The circuit diagram in FIG. 7 shows the case where from advancing toreversing movement while the copy stand is stopping, as in FIG. 1, rightabove the casing l, i.e., at the end of the reversing process b, andFIG. 8

shows the case where the reversing-advancing movement is carried outwhile the copy stand is stopping at the end of the advancing process a,i.e., the position of solid line in FIG. 2. In FIG. 8, when thereversing-advancing movement is carried out, the operation piece 51 forthe micro-switch MS of FIG. 1 is fixed on the maximum copy size, i.e.,at the position of B in the drawing, and the micro-switch MS, is openedby the operation piece 51 to open the magnet MG, for the normal rotationand the lamps L for exposure are closed. As is apparent from FIGS. 1 and3, the position of micro-switch MS, or the operation piece 51 can bevaried for different stop positions of the copy stand. I

reversing movement as is shown in FIG. 5 at the position where thereversing movement is completed to release the reversal rotation magnetM6,, and the copy stand 4 is stopped. When the copy stand 4 is stopped,the photosensitive paper opens the micro-switch MS, to release the relayRL,, and therefore the contact K is closed, and the normal rotationmagnet MG, and the exposure lamps L are operated, and the copy stand 4is moved in the advancing direction. The operation piece 51 of the copystand opens the micro-switch MS, to stop the copy stand on the positionwhen the exposure is finished.

The present invention has been explained with respect to the sheet ofthe photosensitive papers, however, as shown in FIG. 10, thephotosensitive paper wound around the roll R may well be used in thepresent invention. In this case, it is necessary to provide a cutter Cbetween, for example, two pairs of rollers 16 and 16" through which thepaper advancing to the charging portion 19.

This invention, in an electronic copier having a horizontally movingcopy stand on the upper portion thereof to carry out slit exposure, wassuch a structure that the copy illuminating portion is provided in thefront portion of the casing, and the image of the copy is projected onthe exposing portion at the rear portion of the casing by means of a Lletter from optical system, a paper feeding base is provided in thespace formed between the copy stand moving surface on the upper portionthereof and the L letter form optical system, and therefore, thestructure of this invention has an advantage to minimize the apparatus.

Furthermore, according to this invention, a liquid developer is providedat the lower portion of the casing following the exposing portion, andthe photosensitive paper having passed the developing means is led intothe front portion of the casing, and the air in the neighborhood of theilluminating portion is sucked by the blower duct provided in the spacebetween the paper feeding base and L letter form optical system, andappropriately heated hot air is jetted to the photosensitive paper tocarry out the dry-fixing operation, and therefore the process ofdevelopment and dry fixation can be included within the casingcompactly. and at the same time, the increase of the temperature withinthe casing caused by the radiant heat of the illuminating portion, canbe controlled, and even if the illuminating portion and the paperfeeding portion should be close, there is no fear that the resistivityof the photosensitive papers should be changed by temperature. An thehot air duct is divided into two. and hot air is jetted to the side endportions of the photosensitive paper, and does not interfere the lightpath of the optical system, and the hot air duct is effective foraccelerating the drying of the rear end portion of the photosensitivepaper where the drying of the developer liquid is slow. According tothis invention, a lid is provided on the upper portion of the paperfeeding base, to prevent the deterioration caused by the naturalexposure of the photosensitive paper, and the position of the lidraising shaft is selected for safetys sake so that when the copy standis moved by mistake while keeping the lid open for fillingphotosensitive papers, there is not fear that the copy stand hits thelid to cause troubles.

We claim:

l. A copying device having a slit-exposure system comprising:

a housing; I

a copy stand on the upper portion of said housing and means forreciprocatingly moving said stand; means for storing, feeding andcharging photosensitivematerial; means for transferring saidphotosensitive material between said feeding means and charging means;means for synchronously moving said copy stand and the photosensitivematerial; slit-exposure meansprovided at a position lower than saidstoring means; means for illuminating the original placed on said copystand;

an L-shaped optical system within the housing for in-- troducing the"light image of the illuminated original to the exposure means;

said storing means being placed at the upper portion of the housing andwithin a space defined by said copy stand and the Lshaped opticalsystem;

a cover for opening and closingthe storing means; and means fordeveloping the photosensitive material.

2. The copying device as claimed in claim 1; and additionallycomprising:

a blowing duct between said storing means and said L-shaped opticalsystem, said duct being shaped to suction air from outside the housingand deliver said air first to said illuminating means and then todeveloped photosensitive material; and

heating means associated with said duct intermediate said illuminatingmeans and said photosensitive material.

3, The copying device as claimed in claim 2, wherein said duct is forkedin two branches to avoid the light path of said L-shaped optical system,said heating means being in said forked branches.

4. The copying device as claimed in claim 1, wherein said cover ispivoted on a shaft connected to said housing at a point not traversed bysaid copy stand, whereby movement of said copy stand is not impeded evenwhen said cover is raised.

5. A copying device having a slit-exposure system comprising:

a housing;

a copy stand on the upper portion of said housing anti having first andsecond oppositely disposed end portions and means for reciprocatinglymoving said stand along a path essentially perpendicular to said firstand second end portions;

means for storing, feeding and charging photosensitive material;

means for transferring said photosensitive material between said feedingmeans and charging means;

means for synchronously moving said copy stand and the photosensitivematerial;

means for illuminating the original placed on said copy stand; astationary optical system within the housing for introducing the lightimage of the illuminated original to the exposure station, where thelight image of the illuminated original is cast upon the photosensitivematerial;

means for developing the photosensitive material;

said means for reciprocatingly moving said copy stand comprising:

a normal reversal rotation drum;

a belt wound around said drum, one end of said belt being fixed to saidfirst end portion of said copy stand and the other end of said beltbeing fixed to saidsecond end portion of said copy stand; and

means including a drive shaft for rotating said drum in normal andreverse directions.

6. A copying device having a slit-exposure system comprising:

a housing;

a copy stand on the upper portion of said housing and means forreciprocatingly moving said stand; means for storing, feeding andcharging photosensitive material;

means for transferring said photosensitive material between said feedingmeans and charging means;

means for synchronously moving said copy stand and the photosensitivematerial;

means'for illuminating the original placed on said copy stand;

a stationary optical system within the housing for introducing the lightimage of the illuminated original to the exposure station, where thelight image of the illuminated original is cast upon the photosensitivematerial;

means for developing the photosensitive material; said means forsynchronously moving said copy stand and the photosensitive materialcomprise:

means for normally stopping said copy stand at the terminal position ofits normal movement and initiating reverse movement;

means for feeding the photosensitive material at a predeterminedposition in the reverse movement of said copy stand; and

means for synchronously driving the photosensitive material to theslit-exposure position when said copy stand arrives at the illuminatingposition.

7. The copying device as claimed in claim 6, wherein said means fornormally stopping said copy stand is moveable, whereby the terminalposition of said copy stand is adjustable in accordance with the size ofthe original.

8. The copying device as claimed in claim 7, wherein said moveablestopping means is mounted on said copy stand.

9. The copying device as claimed in claim 5, wherein said drum rotatingmeans includes means for absorbing the shock produced when reversemovement of said copy stand is initiated.

10. A copying device having a slit-exposure system comprising:

a housing;

a copy stand on the upper portion of said housing and means forreciprocatingly moving said stand; means for storing, feeding andcharging photosensitive material;

means for transferring said photosensitive material between said feedingmeans and charging means;

means forsynchronously moving said copy stand and the photosensitivematerial;

means for illuminating the original placed on said copy stand;

a stationary optical system within the housing for introducing the lightimage of the illuminated original to the exposure station, where thelight image of the illuminated original is cast upon the photosensitivematerial;

mal movement of said copy stand in accordance with the size of theoriginal, said travelling distance adjusting means being mounted on saidcopy stand; and means for developing the photosensitive material.

1. A copying device having a slit-exposure system comprising: a housing;a copy stand on the upper portion of said housing and means forreciprocatingly moving said stand; means for storing, feeding andcharging photosensitive material; means for transferring saidphotosensitive material between said feeding means and charging means;means for synchronously moving said copy stand and the photosensitivematerial; slit-exposure means provided at a position lower than saidstoring means; means for illuminating the original placed on said copystand; an L-shaped optical system within the housing for introducing thelight image of the illuminated original to the exposure means; saidstoring means being placed at the upper portion of the housing andwithin a space defined by said copy stand and the L-shaped opticalsystem; a cover for opening and closing the storing means; and means fordeveloping the photosensitive material.
 2. The copying device as claimedin claim 1, and additionally comprising: a blowing duct between saidstoring means and said L-shaped optical system, said duct being shapedto suction air from outside the housing and deliver said air first tosaid illuminating means and then to developed photosensitive material;and heating means associated with said duct intermediate saidilluminating means and said photosensitive material.
 3. The copyingdevice as claimed in claim 2, wherein said duct is forked in twobranches to avoid the light path of said L-shaped optical system, saidheating means being in said forked branches.
 4. The copying device asclaimed in claim 1, wherein said cover is pivoted on a shaft connectedto said housing at a point not traversed by said copy stand, wherebymovement of said copy stand is not impeded even when said cover israised.
 5. A copying device having a slit-exposure system comprising: ahousing; a copy stand on the upper portion of said housing and havingfirst and second oppositely disposed end portions and means forreciprocatingly moving said stand along a path essentially perpendicularto said first and second end portions; means for storing, feeding andcharging photosensitive material; means for transferring saidphotosensitive material between said feeding means and charging means;means for synchronously moving said copy stand and the photosensitivematerial; means for illuminating the original placed on said copy stand;a stationary optical system within the housing for introducing the lightimage of the illuminated original to the exposure station, wherE thelight image of the illuminated original is cast upon the photosensitivematerial; means for developing the photosensitive material; said meansfor reciprocatingly moving said copy stand comprising: a normal reversalrotation drum; a belt wound around said drum, one end of said belt beingfixed to said first end portion of said copy stand and the other end ofsaid belt being fixed to said second end portion of said copy stand; andmeans including a drive shaft for rotating said drum in normal andreverse directions.
 6. A copying device having a slit-exposure systemcomprising: a housing; a copy stand on the upper portion of said housingand means for reciprocatingly moving said stand; means for storing,feeding and charging photosensitive material; means for transferringsaid photosensitive material between said feeding means and chargingmeans; means for synchronously moving said copy stand and thephotosensitive material; means for illuminating the original placed onsaid copy stand; a stationary optical system within the housing forintroducing the light image of the illuminated original to the exposurestation, where the light image of the illuminated original is cast uponthe photosensitive material; means for developing the photosensitivematerial; said means for synchronously moving said copy stand and thephotosensitive material comprise: means for normally stopping said copystand at the terminal position of its normal movement and initiatingreverse movement; means for feeding the photosensitive material at apredetermined position in the reverse movement of said copy stand; andmeans for synchronously driving the photosensitive material to theslit-exposure position when said copy stand arrives at the illuminatingposition.
 7. The copying device as claimed in claim 6, wherein saidmeans for normally stopping said copy stand is moveable, whereby theterminal position of said copy stand is adjustable in accordance withthe size of the original.
 8. The copying device as claimed in claim 7,wherein said moveable stopping means is mounted on said copy stand. 9.The copying device as claimed in claim 5, wherein said drum rotatingmeans includes means for absorbing the shock produced when reversemovement of said copy stand is initiated.
 10. A copying device having aslit-exposure system comprising: a housing; a copy stand on the upperportion of said housing and means for reciprocatingly moving said stand;means for storing, feeding and charging photosensitive material; meansfor transferring said photosensitive material between said feeding meansand charging means; means for synchronously moving said copy stand andthe photosensitive material; means for illuminating the original placedon said copy stand; a stationary optical system within the housing forintroducing the light image of the illuminated original to the exposurestation, where the light image of the illuminated original is cast uponthe photosensitive material; means for normally stopping said copy standat the start position of its normal movement and initiating normalmovement responsive to the arrival of the photosensitive material in theslit-exposure position; means for adjusting the travelling distance ofthe normal movement of said copy stand in accordance with the size ofthe original, said travelling distance adjusting means being mounted onsaid copy stand; and means for developing the photosensitive material.